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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '66e3b8a9a64e155c8b0f9681179f14a5b1a9dcbd12e2755abd87ada94bbc7eb6' 
  AND token = 'ZD8ATIHvbGwe3FHP/aX2cui77A5AKVYV9R3+48Mu00A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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