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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '0eba1100bd62fc9d96ae0bcbcaa4cdc6e6d26eee6e05b77319bf2b148f76af93' 
  AND token = 'RaW045m4aepvEA0G2Ci8ZXh9Zore2mSMAtsYAFXUe5E=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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