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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eab62c87e845a78917a466c66b73f4d28c710fedf09f2e6e0a66e8b4d6669267' 
  AND token = 'bH+HEgQ8zHhfJLI6gMIGMUe18S+cBfIIybj1zVchQzo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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