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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '94bfcc119ef3a2c2b6461779c271c5dec2fca9e6a147c62107e3c6504e618ada' 
  AND token = 'ApEDFZkw+8lnLzvoAYfiP/a/kMj8rA6dnLoH9/b4jms=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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