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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = '021dff4d3fcf1e497e52142856d687364843d76e1e5c0b0cf2804ceb53669a79' 
  AND token = 'Hvs0QgWgRGlTgGEEAcx8A140KQhf4hXi4h0PIoe2u4o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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