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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = '6ce2f87204ede9540287d0f5c4bb138e46a49456c9348565c432e0498eac6342' 
  AND token = 'LDyd1OeMfg7BHxCak2Iv4smo0SfYJV5i8JA0OKkDvSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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