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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '594db1f4d387d503fbcc65ac8493814e1ad12df9fc311e7e44443df18d383939' 
  AND token = 'gRtu2kZQrpRydRZydp7OiLBx0gczI9dIvvfvQQ8De1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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