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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7f2db0b5dfe1a1aa234cdceaa27f37c2bfecf458ff4a1b805328dd26ad3f07ef' 
  AND token = 'Cgi+KkQ7BUWMeCj7hMJEgjUhMAj70c5hRpWJZ2QK1VY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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