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SELECT 
  1 
FROM 
  cscart_multi_declock_keys 
WHERE 
  key_id = '88c307df5378104c818b69fc268f102394a2cce8c1e70afddd75855cec29d26b' 
  AND token = 'eQF+b1uYj5GKT36Gt/0HeQ/H4VQluXS8KnfjrC15MNY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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