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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '9e7553e73dbe4ec62296db4b45bda884f19342ab65918ea2466a844f16c295b2' 
  AND token = 'Vpd37lY/kJ9kKOcJ7xxn2iJx3ZgcGuK7756vws+5Efc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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