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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '74a13a266fdd2561df0dd5e53ed7ee16a615a935420e299cafc0b5adcad44cb8' 
  AND token = '7h8v06lWrlZgtnIxKTLs9mywXaIYUXVa7vt7FaBm6BA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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