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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '661499e18c97375f3d5dbc1db0e5f7a0862bc52027635bde95862f2df374da3c' 
  AND token = 'wkrTs4lPKx1U6Pn8xoy+/mtZ7BC2LZErO4wklfbjc+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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