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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'd56cc5872d1a2fec8fc3830e6a2b0fe54b8471c0751f3e8d1580fb26d418b083' 
  AND token = 'poXk3H0prXTJsnHLgUO7AVls+LfVFeSPQPSxteqZr9g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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