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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'a6dac3aee4ba1bc1e26c820385079fd68a62974e64fc5606c5c0851bb0ec82ce' 
  AND token = 'VawJKx93ppvtkPEtsFedXjFhV++mmSAu2wypCv2XddQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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