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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '523eef7d940259a24562fcb313b3cfd962f8f8f74a808dbd6a0a67b486b3e090' 
  AND token = 'ogRuFWnsixZ40SgYfgtWA4yfjDUx2futhRCkTjyJoEs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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