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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '3b058411d852322bad44df42efbdb4a7fcbb2223d6a826135a87e536e7aae626' 
  AND token = 'N1+JDiCoq37ySsoVd8FAg4Lnt6E+YMXgoAgkJZchR2k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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