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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'f477d85dc7ab38d74044f501373d8584c155894eec06b8f2e3b687cf487fffde' 
  AND token = 'EOMe1mZ3+M7oaRg/VfeOWyQWtOq18Le91fIpTZzsPSE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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