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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'eea65b3059f2a911f40fdd8a895ee7cafa0dfc314260481142eaf3f5c76024df' 
  AND token = 'odDo8ZWsYeNZx+jMvZUSMeR4r0m4+mm6ZN2UXXOgicQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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