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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = 'ea41b75e41a99d0242398f4019124a1a98eefedf99cc2d07f4141eb8332916a9' 
  AND token = 'bwh4iP+CE4pFkBjSykx7ZwGhwGeqdJf3YPqJcl32Hi0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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