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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'e8991dc3e2457737f2d4a145cde3222f719c26e4972ed9dfa9298590c84223df' 
  AND token = 'rEUR4pebhv7s4bTEjSt0ghDxkndrD+dDt3FjxP5/0h8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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