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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '2956a3d57d0fbc3d55cbcd5e85a202f74bb2b45bd6ef30755990bad6cebee342' 
  AND token = 'OTQ5uLuqkA0OLSNSl9+FiRHIrdlcKjQDoo2THq7PeA0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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