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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '2be4861864ac5b6004e5ebebf08864601e0b969a02ee56472e0ca7349994ede3' 
  AND token = 'Tj/+fekrj5x9xIdgPdMAQh/Nu4SKCWYlYervxQ1Dq5Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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