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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '7a4d94951257bde9828a28a794725b7b0eaa138ee0a7a2c8e642e2a79486af92' 
  AND token = 'job583j8nd7mML+gSxdMIdk/yLkzRvdBrUrYggiJP3I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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