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SELECT 
  1 
FROM 
  cscart_june_setuplock_keys 
WHERE 
  key_id = 'cab5e13fedfaabaa466bac3989a6b7fca3958d8b9e6c6e3ecba9580a078ac2af' 
  AND token = 'ak08Lc1YkT2vaaXfaRMXSCy4D5awNtujP+3f+php+D4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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