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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'f4623ea35db81218ff1836e629a989527e7b40489b926a8eeeb1246b701df34c' 
  AND token = 'vXKfrch8k1m1h6COKyTeH41gP2aMVX0msVQLHx+LOfc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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