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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'cc91088415222e1180b259f4241fef99db00c74933291a88e3f48c5d6669f3c3' 
  AND token = '3c7kF5jRG+TTk0B2r2z991YidcwDAdfpqCQffpRZnkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}