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SELECT 
  1 
FROM 
  q_lock_keys 
WHERE 
  key_id = 'b2f70c8d723dfc5d4abf6f6e949eea8cef3f2cd740800d600a3d0ef283c9ee2d' 
  AND token = 'PqEjigz9xde0n8DbjzRbvUGfdzj1a7qI7Jl0Jz9SI5o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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