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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '191bc62fec3a9a1c6ebb0ac21603ae95bb757c7376fea88ef5a32ab163a9cfe6' 
  AND token = 'jZ5+TjYxpjTjb4b6SgODzRvTPcB7S7n+W1yE1RXMTkg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00055

JSON explain

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