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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '37c1f18fc0480ae73a19c2e80d20c36287e6633cf542b9fc7e27de454e390ef0' 
  AND token = 'ai9eIn88/X81AMXoLx2XOcPTjD7UOpqAMmC9uLHZpSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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