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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '879edafa147ca8aa015a675479ebdc7ddd4f7826bdbbfbe6c5f1ad732ca3afd8' 
  AND token = 'k6h/x4TYdxvQWL+QNoT86kmXg7yyQVfZfQL06Iw1fE8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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