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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f9ea48f78504ee7c0e019573b907f0791caec4bcc768e01bcfe7e87df69a6748' 
  AND token = '7Yz/KqD56QDzERQSmnmVxT3SnDIWMuHezMuHjcyoH90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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